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CX86500-27

V.92/V.34/V.32bis Modem in 28-Pin or 38-Pin TSSOP with CX20493 SmartDAA®

Conexant Systems 

CX86500 SCXV.xx Modem Data Sheet

1.

Introduction

1.1

Overview

The Conexant® SCXV.92, SCXV.34, and SCXV.32bis modems are worldwide

operational modem device sets for embedded applications that support modulations up to

V.92, V.34, and V.32bis, respectively (refer to Table 1-1). All modems also support

V.44/V.42bis/MNP 5 data compression for greater data throughput, V.42 LAPM/MNP2-

4 error correction protocol for increased data integrity and reliability.

The SCXV.92/V.34/V.32bis device set consists of a modem device and a SmartDAA® 3

Line Side Device (LSD). The modem device integrates a microcontroller (MCU), a

digital signal processor (DSP), and a SmartDAA system side device (SSD) onto a single

die. The modem is available in 28-pin or 38-pin TSSOP versions. The 28-pin version is

for serial interface applications and is footprint-compatible with the CX84100

(SCXV.22bis) and CX81801-9x (SmartV.XX) modem devices. The 38-pin version is for

serial or parallel interface applications (interface type selectable by an I/O pin). Major

hardware interfaces are illustrated in Figure 1-1.

Conexant’s SmartDAA technology used in the SmartDAA 3 LSD eliminates the need for

bulky analog transformers, relays, and opto-isolators typically used in discrete DAA

implementations. The SmartDAA 3 LSD operates without drawing power from the phone

line, unlike line-powered DAAs, and is therefore not subject to variations in line voltage

conditions. The SmartDAA 3 LSD also adds enhanced telephony extension features to

the modem’s operation and other functions such as Call Waiting detection, and Caller ID

decoding. Incorporating Conexant’s proprietary Digital Isolation Barrier (DIB) design

and other innovative DAA features, the SmartDAA architecture simplifies application

design and minimizes layout area to reduce design cost. The SmartDAA 3 LSD is

available in a 28-pin Quad Flat No-lead (QFN) package or in a 32-pin Low Profile Quad

Pack (LQFP) package.

The modem operates by executing masked code from internal ROM. The modem features

internal RAM memory that enhances the modem's flexibility. The modem's internal

RAM can be used to load new country profiles, override existing country profiles or add

customized firmware code. An optional external serial NVRAM is supported by the 38-

pin version. The optional external NVRAM adds the convenience of permanent storage,

just like internal RAM, NVRAM can be used to store new country profiles, override

existing ones or add customized firmware code.

Small, low-profile packages, reduced voltage operation, and low power consumption

make this device set an ideal solution for embedded applications.

102287F

Conexant

1-1

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